CN113862798B

CN113862798B - Electrostatic spinning emitter

Info

Publication number: CN113862798B
Application number: CN202111141056.5A
Authority: CN
Inventors: 蔡云屾
Original assignee: Kuncheng New Material Technology Jiangsu Co ltd
Current assignee: Kuncheng New Material Technology Jiangsu Co ltd
Priority date: 2021-09-28
Filing date: 2021-09-28
Publication date: 2023-03-31
Anticipated expiration: 2041-09-28
Also published as: CN113862798A

Abstract

The invention provides an electrostatic spinning emitter which moves in an electrostatic spinning working area along with an annular insulating transmission belt, a liquid adding device, an emitter cleaning device and an emitter drying device. The liquid adding device can coat the spinning liquid with any amount on any appointed position of the emitting electrode. In the electrostatic spinning working area, the spinning solution carried by the emitter forms nano fibers under the action of a high-voltage electric field and is deposited on the substrate. After passing through the electrostatic spinning working area, the emitter is conveyed into an emitter cleaning device for cleaning, and is dried by a subsequent emitter drying device and then put into use again. The method not only realizes continuous, stable and large-scale nanofiber production, but also avoids the problems of needle head blockage, low productivity, easiness in splashing, serious electric field interference among multiple jet flows and the like. Secondly, the invention can also freely adjust the distribution position of the electrostatic spinning nano-fiber on the substrate and the deposition thickness.

Description

Electrostatic spinning emitter

Technical Field

The invention belongs to the field of electrostatic spinning, and particularly relates to electrostatic spinning equipment.

Technical Field

Electrostatic spinning is an important method for preparing functional nanofiber membranes. Especially in recent years, the electrostatic spinning technology has become the mainstream technology of nanofiber manufacturing due to the characteristics of continuity, convenience, rapidness, simple process and low cost. At present, the scale electrostatic spinning Technology is divided into two types, one type is multi-needle electrostatic spinning Technology, and representative companies are Fineex Technology Inc. and TOPTECH and the like; another type is the non-needle electrospinning technique, represented by the companies Donaldson and Elmarco et al. The product is widely applied to a plurality of high-tech fields such as filter materials, biomedical materials, energy battery materials, intelligent wearing materials and the like.

In the electrospinning technology, for example, the technologies disclosed in patent application nos. 200910087706.5, 202011163131.3, 201310186515.0, and 202011244188.6 realize the large-scale production of electrospun nanofibers, but the existing electrospinning mass production equipment has some pain points. Although the nanofiber membrane produced by the multi-needle electrostatic spinning equipment is relatively uniform, the problems of easy blockage of needles, low productivity, difficult maintenance and the like exist; the existing non-needle electrostatic spinning equipment has the problems of needle blockage, high productivity, uneven thickness of the obtained fiber, splashing, serious electric field interference among multiple jet flows (End effect phenomenon) and the like.

The warp-weft bidirectional electrostatic spinning film-making equipment disclosed by the Chinese invention patent with the application number of 200910087706.5 adopts a plurality of groups of warp-wise spinneret groups or weft-wise spinneret groups with needles as emitting electrodes of electrostatic spinning, and the emitting electrodes are distributed on the upper part of a nanofiber receiver. The problems of easy needle blockage, low productivity and low efficiency can occur due to the adoption of the needle type emitting electrodes, and in addition, the problem of uneven thickness distribution of the nano fibers on the base material can occur due to the adoption of the needle type needle head distribution method with alternate warps and wefts, especially when the distribution direction of the needle heads is vertical to the movement direction of the base material. Secondly, the needle head is positioned above the receiving electrode, electrostatic spinning is carried out from top to bottom, and the problem that the nano fiber membrane has flaws due to the fact that solution drips on the receiving electrode from the needle head easily occurs.

The matrix type multi-needle electrostatic spinning equipment disclosed by the Chinese invention patent with the application number of 202011163131.3 uses a spinning needle device with multiple needles to move back and forth on a linear module, and then carries out spinning from bottom to top to prepare nano-fiber yarns. The problems of easy needle blockage, low productivity and low efficiency still occur because the needle type emitter is adopted. Meanwhile, the number of needles used is large, and the maintenance is complicated.

The tip type pinless electrostatic spinning equipment disclosed by the Chinese invention patent with the application number of 201310186515.0 uses an annular moving chain to drive a spinneret plate to reciprocate between an upper electrostatic spinning working area and a lower liquid box so as to realize the preparation of electrostatic spinning nanofibers continuously. However, the emitter is a metal card clothing, and is a needle emitter essentially, so that the problem of needle blockage is avoided, but the problems of low production capacity and low efficiency are caused by the limitation of the number of needles on the card clothing. In addition, the card clothing moves back and forth between the electrostatic spinning working area and the solution of the liquid box for a long time, residues after the electrostatic spinning of the high molecular solution can be deposited on the needle head, the subsequent electrostatic spinning process is influenced, and the instability of products is caused.

The electrostatic spinning equipment disclosed by the Chinese invention patent with the application number of 202011244188.6 adopts a steel wire as an emitting electrode, and deposits nano fibers on a receiver from bottom to top to form large-scale production. In the apparatus, a spinning solution is applied to a wire emitter by a reciprocating coating head. The solution supply mode can cause uneven distribution of the spinning solution on the steel wire, thereby causing the problem of uneven thickness of deposited nano fibers on the substrate; in addition, the spinning solution is excessively gathered at some places on the steel wire, and under the influence of a high-voltage electric field, the problem of liquid drop splashing is generated, so that the product is flawed. Secondly, the method of coating and supplying liquid on the steel wire can not accurately control the amount of the spinning liquid carried on the steel wire, and if the spinning liquid carried on the steel wire is too much, the problem of electric field interference among multiple jet flows can occur; if the spinning solution carried on the steel wire is too little, the polymer solution will dry on the surface of the steel wire, and the phenomena of 'flying and hanging' will occur. These all lead to problems of instability of electrospinning.

Disclosure of Invention

It is to be understood that all combinations of the foregoing concepts and additional concepts discussed in greater detail below (assuming such concepts are not mutually inconsistent) are considered to be part of the inventive subject matter disclosed herein. In particular, all combinations of claimed subject matter appearing in this disclosure are considered part of the inventive subject matter disclosed herein. It should also be understood that the terminology explicitly used herein may be found in any disclosure incorporated by reference herein, and should be accorded the most consistent meaning with the specific concepts disclosed herein.

In order to solve the pain point in the existing electrostatic spinning mass production equipment, the stable mass production of electrostatic spinning nano-fibers is realized, and the electrostatic spinning nano-fibers are more widely applied to more fields. The invention provides an electrostatic spinning emitter, which can realize stable and continuous large-scale production of electrostatic spinning. In addition, the electrostatic spinning emitter provided by the invention can flexibly adjust the distribution of the nano fibers on the substrate.

The invention provides an electrostatic spinning emitter, which has the following characteristics that: the device comprises a liquid adding device, an annular emitter system, an emitter cleaning device and an emitter drying device; the liquid adding device is positioned above the inlet end of the annular emitting electrode system, and spinning liquid in the liquid adding device is coated on the emitting electrode in the annular emitting electrode system; the emitter moves forwards along with the annular emitter system, and after the emitter contacts a piezoelectric plate with positive high voltage electricity, the spinning solution carried on the emitter forms an electrostatic spinning solution bundle and emits the electrostatic spinning solution bundle to a receiver (the receiver is required to be drawn in the attached figures of the specification); when the emitter moves to the outlet of the annular emitter system, the emitter is separated from the positive high-voltage electric plate and enters the emitter cleaning device below the front side of the annular emitter system for cleaning; and then the emitter is dried by an emitter drying device below the annular emitter system and returns to the inlet of the annular emitter system again to wait for receiving the liquid of the liquid adding device.

The electrostatic spinning emitter is characterized in that the liquid adding device comprises a liquid storage box, a linear module, a glue dispensing gun and a glue dispensing gun control system; the linear module is parallel to the emitting electrode and is arranged perpendicular to the motion direction of the annular emitting electrode; the glue dispensing gun is positioned on the linear module and can move along with the linear module; a liquid inlet of the glue dispensing gun is connected with an external liquid storage box; the liquid output of the glue dispensing gun is controlled by a glue dispensing gun control system.

The electrostatic spinning emitter is characterized in that the dispensing gun can coat spinning solution with any amount at any specified position of the emitter under the synergistic action of the dispensing gun control system and the linear module. Preferably, the spinning solutions coated on the emitter by the dispensing gun should not be connected, the spinning solutions should be discontinuous on the emitter, and the distance between the spinning solutions should be greater than 5mm. Preferably, the distance between the spinning solutions coated on the emitter by the glue dispensing gun can be fixed or random. Preferably, the amount of spinning liquid applied to the emitter is such that the spinning liquid on the emitter does not dry when the emitter is moved to the outlet of the annular emitter system. The liquid amount and the position of each spinning solution concentration point on the emitting electrode are controllable, so that the electrostatic spinning process is more controllable and stable. In addition, the liquid amount and the position of each spinning liquid concentration point on the emitting electrode are controllable, so that the deposition position of the electrostatic spinning nano-fibers on the substrate and the deposition amount can be freely adjusted.

The electrostatic spinning emitter is characterized in that the annular emitter system comprises a plurality of emitters, a positive high-voltage electric plate, two annular insulating transmission belts, a transmission belt driving roller, a transmission belt driven roller, a transmission belt motor, a speed reducer and a transmission belt motor coupler; the two annular insulating transmission belts are arranged between the transmission belt driving roller and the transmission belt driven roller and are respectively positioned at the two ends of the transmission belt driving roller and the transmission belt driven roller; the emitting electrodes are vertical to the transmission direction of the annular insulating transmission belts and are uniformly distributed between the two annular insulating transmission belts; the emitting electrode is driven by a transmission belt motor, a speed reducer and a transmission belt motor coupler to do annular motion; the positive high-voltage piezoelectric plate is connected with an external positive high-voltage power supply, is arranged above an annular insulating transmission belt, has a distance of 300mm with the inlet of an annular emitter electrode system, and is contacted with an emitter electrode on the annular insulating transmission belt.

The electrostatic spinning emitter is characterized in that the distance between the emitters uniformly distributed on the annular insulating transmission belt is 50-400 mm. Preferably, the distance between the emitters on the annular insulating transmission belt is 50mm-100mm. Too small a distance between emitters can lead to problems of electric field interference between multiple jets, and too large a distance between emitters can affect production throughput.

The electrostatic spinning emitter is characterized in that the emitter is made of stainless steel, molybdenum, aluminum alloy and copper; the shape of the strip is a strip with a rectangular, square, triangular or semicircular cross section; the surface of the material can be smooth or decorated with convex points and concave points to increase the local electric field intensity.

The electrostatic spinning emitter has the following characteristics that the average linear speed of the annular motion of the emitter is 0.01m/s-0.5m/s; and when the emitter moves to the position below the outlet of the dispensing gun, the emitter stops for 1-5 s, so that the dispensing gun finishes the work of liquid on the emitter. Preferably, the emitter ring motion is a uniform rate motion.

The electrostatic spinning emitter is characterized in that the emitter cleaning device is positioned below the annular emitter system and comprises: the cleaning device comprises a cleaning tank, cleaning liquid, a cleaning brush head, a cleaning driving motor, a speed reducer and a cleaning motor coupler; the cleaning brush head is arranged in a cleaning tank filled with cleaning liquid; the lower half part of the cleaning brush head is immersed in the cleaning liquid, and the upper half part of the cleaning brush head is contacted with the emitting electrode; under the drive of the cleaning driving motor, the speed reducer and the cleaning motor coupler, the cleaning brush head cleans the residual spinning solution on the emitter after electrostatic spinning.

The electrostatic spinning emitter is characterized in that the emitter drying device is a hot air device, is positioned below the annular emitter system and is behind the emitter cleaning device; the temperature of hot air generated by the emitter drying device is 40-80 ℃, and the air speed is 1-10 m/s.

The electrostatic spinning emitter is characterized in that the liquid adding device, the annular emitter system, the emitter cleaning device and the emitter drying device are positioned between the unwinding device and the winding device in the electrostatic spinning system and below the spinning receiving electrode; the base material is uncoiled by a driving uncoiling roller of an uncoiling device, passes through an uncoiling guide roller, receives the nano fibers formed by the electrostatic spinning liquid beams emitted by the emitting electrode below a spinning receiving electrode, and is coiled on a driving coiling roller of a coiling device after passing through a coiling guide roller. Furthermore, a post-treatment device for the nano-fibers, such as hot pressing, hot air, ultraviolet curing, film coating and the like, can be added between the annular emitter system and the winding device. Furthermore, a pretreatment device for the nano-fiber, such as sizing, electrostatic removal and the like, can be added between the annular emitting electrode system and the unreeling device.

Compared with the prior art, the invention has the advantages that:

the electrostatic spinning emitter is a non-needle electrostatic spinning emitter, and can avoid the problems of easy blockage of a needle head, low productivity and the like.

The electrostatic spinning emitter is a non-needle electrostatic spinning emitter, but the spinning solution amount and the spinning solution gathering position of the spinning solution carried on the electrostatic spinning emitter are accurate and controllable, so that the problems of uneven spinning nanofiber thickness, easiness in splashing, serious electric field interference among multiple jet flows (End effect phenomenon) and the like can be avoided.

The electrostatic spinning emitter is a non-needle electrostatic spinning emitter, but the spinning solution amount and the spinning solution gathering position carried on the electrostatic spinning emitter are accurately controllable, so that the distribution position and the deposition thickness of electrostatic spinning nano fibers on a substrate can be freely adjusted.

The electrostatic spinning emitter self-cleaning system can avoid the problem of difficult maintenance of a spinning device.

Drawings

FIG. 1 is a schematic view of an electrostatic spinning emitter structure according to the present invention;

FIG. 2 is a schematic diagram of an electrostatic spinning emitter according to the present invention in an electrostatic spinning apparatus;

FIG. 3 is a schematic diagram of the non-uniform distribution (top) and uniform distribution (bottom) of the spinning solution on the emitter in an electrospinning emitter according to the present invention;

in the drawings: 100. a liquid adding device; 101. a liquid storage box; 102. a linear module; 103. dispensing a glue gun; 104. a dispensing gun control system; 200. a ring emitter system; 201. an emitter electrode; 202. a positive high voltage piezoelectric plate; 203. an annular insulating drive belt; 204. a drive roller of the drive belt; 205. a belt driven roller; 206. a transmission belt motor and a speed reducer; 207. a drive belt motor coupling; 208. electrostatic spinning liquid bundles; 300. an emitter cleaning device; 301. a cleaning tank; 303. cleaning the brush head; 304. cleaning a driving motor and a speed reducer; 305. cleaning the motor coupler; 400. an emitter drying device; 500. a receiver electrode; 600. an unwinding device; 601. unwinding a guide roller; 602. an active unwinding roller; 700. a winding device; 701. a winding guide roller; 702. and (6) driving a wind-up roll.

Detailed Description

In the following detailed description, for purposes of explanation and not limitation, representative embodiments disclosing specific details are set forth in order to provide a thorough understanding of the claimed invention. However, it will be apparent to one having ordinary skill in the art having had the benefit of the present disclosure that other embodiments according to the teachings of the present invention that depart from the details disclosed herein remain within the scope of the appended claims. Moreover, descriptions of well-known apparatus and methods may be omitted so as to not obscure the description of the representative embodiments. Such methods and apparatus are clearly within the scope of the claimed invention.

The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.

Example 1

The invention relates to a nanofiber waterproof composite fabric prepared by using an electrostatic spinning emitter. The electrostatic spinning nanofiber waterproof composite fabric is prepared by compounding an electrostatic spinning waterproof nanofiber membrane and a polyester fabric. The nanofiber membrane used needs to be uniform and have a thickness of 20 μm. In order to meet the above requirements, the nanofiber material used was chosen to be PVDF.

PVDF is dissolved in DMF and prepared so as to be 20wt% PVDF/DMF solution as a spinning solution to be reserved in the liquid storage tank 101 for use.

DMF was added to the cleaning tank 301 as a cleaning solution, which was allowed to sink one-fourth of the height of the cleaning brush head 303.

The terylene fabric is used as a substrate and is arranged between the unreeling device 600 and the reeling device 700, the substrate moves at a constant speed, and the linear speed is 0.1m/s.

A stainless steel strip with a cross section of 3mm long and a width of 1mm and a smooth surface is selected as the spinning emitter 201. The emitting electrodes 201 are uniformly distributed on the annular insulating transmission belt 204, and the distance is 50mm.

The positive high voltage plate 202 is connected to an external positive high voltage power supply with a positive high voltage of 70 kV. The receiver 500 is connected to an external negative high voltage power supply with a negative high voltage of 5 kV.

After being unwound by the unwinding device 600, the substrate passes through an unwinding guide roll 601 and enters an electrospinning region located between the electrospinning system 200 and the receiving electrode 500.

Under the action of the dispensing gun control system 104, the spinning solution coated on the emitter 201 below the dispensing gun 103 covers the upper surface of the whole emitter 201 within 1 s. The liquid carrying amount of each spinning solution concentration point is 0.03ml, the distance between the spinning solution concentration points is 5mm, and the spinning solution concentration points are uniformly distributed on the upper surface of the emitting electrode 201.

Under the drive of the transmission belt motor and speed reducer 206 and the transmission belt motor coupling 207, the emitter 201 makes a uniform variable-speed motion along with the annular insulating transmission belt 204. Moving from the inlet of the electrospinning system 200 to the outlet of the electrospinning system 200 in a direction facing the receiving pole 500. Moving from the outlet of the electrospinning system 200 to the inlet of the electrospinning system 200 in a direction away from the receiving electrode 500. Each time the emitter 201 passes right under the dispensing gun 103, the emitter 201 is stopped for 1s, and the dispensing gun 103 has enough time to coat the spinning solution on the surface of the emitter 201. The average linear velocity of the emitter 201 was 0.01m/s.

With the movement of the annular insulating transmission belt 204, when the emitter 201 thereon contacts the positive high voltage electric plate 202, a high voltage electric field required for electrostatic spinning is formed between the emitter 201 and the receiver 500.

Under the action of the high-voltage electric field, the spinning solution carried on the emitter 201 is excited to form an electrostatic spinning solution bundle 208.

With the movement of the annular insulating transmission belt 204, when the emitter 201 on the belt leaves from the outlet of the electrospinning system 200, the emitter 201 is disconnected from the positive high voltage electric plate 202 and enters the emitter cleaning device 300.

The cleaning brush head 303 with the cleaning liquid cleans the residual spinning solution on the surface of the emitting electrode 201 under the driving of the cleaning driving motor and speed reducer 304 and the cleaning motor coupling 305.

With the movement of the endless insulated transmission belt 204, the emitter 201 thereon enters the emitter drying apparatus 400 after exiting from the emitter cleaning apparatus 300.

And volatilizing the residual cleaning solution on the emitting electrode 201 at the temperature of 80 ℃ in a hot air environment of 10m/s, and then finishing cleaning.

With the movement of the endless insulated belt 204, the emitter 201 thereon is again ready to enter the electrospinning region from the inlet of the electrospinning system 200 after exiting the emitter drying apparatus 400.

In the electrospinning zone, the electrospinning liquid beams 208 finally form PVDF nanofibers deposited on the substrate to form a nanofiber waterproof composite fabric having a waterproof nanofiber membrane with a thickness of 20 μm.

The nanofiber waterproof composite fabric is wound on an active winding roller 702 of a winding device 700 after passing through a winding guide roller 701 to form a final product.

Example 2

The H13-grade nanofiber PET composite filter material is prepared by the electrostatic spinning emitter. The high-efficiency composite filter material is prepared by compounding an electrostatic spinning nanofiber membrane with high-efficiency filtering performance and a PET (polyethylene terephthalate) base material. The nanofiber membranes used need to be uniform and have an average fiber diameter of 200nm and a thickness of 10 μm to achieve filtration performance on the H13 filtration scale. In order to meet the above requirements, the nanofiber material used was chosen to be PA6.

PA6 was dissolved in formic acid to prepare a solution of 12wt% PA6/acetic acid as a spinning solution, which was stored in a tank 101.

Acetic acid was added to the cleaning tank 301 as a cleaning solution such that the cleaning solution was over one-fourth the height of the cleaning brush head 303.

PET is used as a substrate and is arranged between the unreeling device 600 and the reeling device 700, the substrate moves at a constant speed, and the linear speed of the substrate is 0.5m/s.

A copper bar with a cross section of a semicircle with a diameter of 3mm and an annular protrusion every 5mm is selected as the spinning emitter 201. The emitting electrodes 201 are uniformly distributed on the annular insulating transmission belt 204, and the distance is 400mm.

The positive high voltage plate 202 is connected to an external positive high voltage power supply with a positive high voltage of 80 kV. The receiver 500 is connected to an external negative high voltage power supply with a negative high voltage of 5 kV.

After being unwound by the unwinding device 600, the substrate passes through the unwinding guide roll 601 and enters the electrospinning region located between the electrospinning system 200 and the receiving electrode 500.

Under the action of the dispensing gun control system 104, the spinning solution coated on the emitter 201 below the dispensing gun 103 covers the upper surface of the whole spinning emitter 201 within 5 s. The liquid carrying amount of each spinning solution concentration point is 0.01ml, the distance between the spinning solution concentration points is 5mm, and the spinning solution concentration points are uniformly distributed on the upper surface of the emitting electrode 201.

The emitter 201 is driven by the belt motor and reducer 206 and the belt motor coupling 207 to move with the annular insulating belt 204 at a constant speed. Moving from the inlet of the electrospinning system 200 to the outlet of the electrospinning system 200 in a direction facing the receiving pole 500. Moving from the outlet of the electrospinning system 200 to the inlet of the electrospinning system 200 in a direction away from the receiving electrode 500. Each time the emitter 201 passes right under the dispensing gun 103, the emitter 201 is stopped for 5s to allow the dispensing gun 103 enough time to coat the spinning solution on the surface of the emitter 201. The average linear velocity of the emitter 201 was 0.5m/s.

And volatilizing the residual cleaning solution on the emitting electrode 201 at 40 ℃ in a hot air environment of 1m/s, and then finishing cleaning.

With the movement of the endless insulated transmission belt 204, the emitter 201 thereon is again ready to enter the electrospinning zone from the inlet of the electrospinning system 200 after coming out of the emitter drying apparatus 400.

In the electrospinning zone, the electrospinning liquid bundle 208 finally formed PA6 nanofibers deposited on the PET substrate to form a nanofiber PET composite filter with H13 filtration performance having an average fiber diameter of 200nm with a thickness of 10 μm.

After passing through the winding guide roller 701, the nanofiber PET composite filter material is wound on an active winding roller 702 of a winding device 700 to form a final product.

Claims

1. An electrostatic spinning emitter is characterized by comprising a liquid adding device (100), an annular emitter system (200), an emitter cleaning device (300) and an emitter drying device (400); the liquid adding device (100) is positioned above the inlet end of the annular emitting electrode system (200), and the spinning liquid in the liquid adding device (100) is coated on the emitting electrode (201) in the annular emitting electrode system (200); the emitting electrodes (201) are connected by an annular insulating transmission belt (203) to form an annular shape, and move forwards along with the annular emitting electrode system (200), after the emitting electrodes (201) contact a positive high-voltage electroplate (202), the spinning solution carried on the emitting electrodes forms electrostatic spinning solution bundles (208) and is emitted to the receiving electrode (500); when the emitter moves to the outlet of the annular emitter system (200), the emitter (201) is separated from the positive high-voltage electric plate (202) and enters an emitter cleaning device (300) below the front side of the annular emitter system (200) for cleaning; then, the emitter (201) is dried by an emitter drying device (400) below the annular emitter system (200), and returns to an inlet of the annular emitter system (200) again to wait for receiving liquid adding of the liquid adding device (100), wherein the liquid adding device (100) comprises a liquid storage box (101), a linear module (102), a dispensing gun (103) and a dispensing gun control system (104); the linear module (102) is parallel to the emitter (201) and is arranged perpendicular to the movement direction of the annular emitter system (200); the glue dispensing gun (103) is positioned on the linear module (102) and can move along with the linear module (102); a liquid inlet of the glue dispensing gun (103) is connected with an external liquid storage box (101); the liquid output amount of the glue dispensing gun (103) is controlled by a glue dispensing gun control system (104).

2. An electrostatic spinning emitter according to claim 1 characterised in that the dispensing gun (103) is adapted to apply the spinning solution to a predetermined position of the emitter (201) in cooperation with the dispensing gun control system (104) and the linear die set (102).

3. An electrospinning emitter electrode according to claim 1, wherein the annular emitter electrode system (200) comprises a plurality of emitter electrodes (201), a positive high voltage electroplate (202), two annular insulating transmission belts (203), a transmission belt driving roller (204), a transmission belt driven roller (205), a transmission belt motor and reducer (206), and a transmission belt motor coupling (207); two annular insulating transmission belts (203) are distributed between the transmission belt driving roller (204) and the transmission belt driven roller (205) and are respectively positioned at two ends of the transmission belt driving roller (204) and the transmission belt driven roller (205); the emitter (201) is vertical to the transmission direction of the annular insulating transmission belt (203) and is uniformly distributed between the two annular insulating transmission belts (203); the emitting electrode (201) is driven by a transmission belt motor, a speed reducer (206) and a transmission belt motor coupling (207) to do annular motion; the positive high voltage electric plate (202) is connected with an external positive high voltage power supply, is arranged above an annular insulating transmission belt (203), has a distance of 300mm with the inlet of the annular emitter system (200), and is contacted with an emitter (201) on the annular insulating transmission belt (203).

4. An electrospinning emitter according to claim 3, wherein the distance between the emitters (201) uniformly distributed on the annular insulating transmission belt (203) is 50mm-400mm.

5. An electrospun emitter according to claim 3 or 4, characterized in that said emitter (201) is made of stainless steel, molybdenum, aluminum alloy or copper; the shape of the strip is a strip with a rectangular, square, triangular or semicircular cross section; the surface of the film can be smooth or decorated with convex points and concave points to increase the local electric field intensity.

6. An electrospinning emitter according to claim 3 or 4, characterized in that the average linear velocity of the circular motion of the emitter (201) is 0.01m/s to 0.5m/s; and when the emitter (201) moves to the position below the outlet of the glue dispensing gun (103), the stop time is 1-5 s, so that the glue dispensing gun (103) finishes the work of the liquid on the emitter (201).

7. An electrostatic spinning emitter according to claim 1 characterised in that said emitter washing device (300) is located below the ring-shaped emitter system (200) and comprises a washing tank (301), a washing liquid, a washing brush head (303), a washing drive motor and reducer (304), and a washing motor coupling (305); the cleaning brush head (303) is arranged in a cleaning tank (301) filled with cleaning liquid; the lower half part of the cleaning brush head (303) is immersed in the cleaning liquid, and the upper half part of the cleaning brush head is contacted with the emitting electrode (201); under the drive of a cleaning driving motor, a speed reducer (304) and a cleaning motor coupler (305), a cleaning brush head (303) cleans spinning solution which is left on an emitting electrode (201) after electrostatic spinning.

8. An electrospun emitter according to claim 1 characterized in that said emitter drying means (400) is a hot air means located below the annular emitter system (200) after the emitter cleaning means (300); the temperature of hot air generated by the emitter drying device (400) is 40-80 ℃, and the air speed is 1-10 m/s.

9. The electrostatic spinning emitter according to claim 1, wherein the liquid adding device (100), the annular emitter system (200), the emitter cleaning device (300) and the emitter drying device (400) are located between the unwinding device (600) and the winding device (700) in the electrostatic spinning system and below the spinning receiving electrode (500); the base material is uncoiled by a driving uncoiling roller (602) of an uncoiling device (600), passes through an uncoiling guide roller (601), receives nano fibers formed by electrostatic spinning liquid beams (208) emitted by an emitting electrode (201) below a spinning receiving electrode (500), passes through a coiling guide roller (701), and is coiled on a driving coiling roller (702) of a coiling device (700).